Journal
JOURNAL OF BIOSCIENCE AND BIOENGINEERING
Volume 108, Issue 1, Pages 36-40Publisher
SOC BIOSCIENCE BIOENGINEERING JAPAN
DOI: 10.1016/j.jbiosc.2009.02.014
Keywords
Caldicellulosiruptor saccharolyticus; Cello-oligosaccharides; Characterization; beta-Glucosidase; Saccharification; Thermostable enzyme
Funding
- Korea Forest Service [S210707L010120]
- Korea Forest Service [S210709L010000] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A recombinant beta-glucosidase from Caldicellulosiruptor saccharolyticus DSM 8903 with a specific activity of 13 U/mg was purified by heat treatment and His-Trap affinity chromatography and identified as a single 54 kDa band on SDS-PAGE. The molecular mass of the native enzyme was 108 kDa as a dimer by gel filtration. beta-Glucosidase showed optimum activity at pH 5.5 and 70 degrees C for p-nitrophenyl (pNP)-beta-D-glucopyranoside. The half-lives of the enzyme at 60, 70, and 80 degrees C were 250, 24.3, and 0.4 h, respectively. The enzyme exhibited catalytic efficiency and specific activity for pNP-beta-D-fucopyranoside, pNP-beta-D-glucopyranoside, and pNP-beta-D-galactopyranoside in decreasing order among aryl-beta-glycosides, but not for aryl-alpha-glycosides. Cello-oligosaccharides from n = 2 to 5 as substrates using 4 mM each sugar and 3 U/mg of enzyme were completely hydrolyzed to glucose at 70 degrees C within 16 h. Crown Copyright (C) 2009, The Society for Biotechnology, Japan. All rights reserved.
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